Service Manual
Table Of Contents
- Latitude 3420 Service Manual
- Working inside your computer
- Removing and installing components
- Recommended tools
- Screw List
- Major components of your system
- MicroSD-card
- SIM card tray
- Base cover
- Battery cable
- Battery
- Memory module
- M.2 solid-state drive thermal plate
- M.2 solid-state drive conversion bracket
- M.2 solid-state drive
- Hard-disk drive
- WLAN card
- WWAN card
- I/O cable
- Display assembly
- System fan
- Heatsink assembly
- Power adapter port
- Coin-cell battery
- USB cable
- Ethernet port
- I/O board
- Power-button board
- System board
- Speakers
- Touchpad
- WWAN I/O board
- Palmrest assembly
- Display bezel
- Display panel
- Camera
- Display cable
- Display back-cover
- Drivers and downloads
- System setup
- Troubleshooting
- Built-in self-test (BIST)
- LCD Built-in Self Test (BIST)
- Dell SupportAssist Pre-boot System Performance Check diagnostics
- Diagnostic LED behavior
- Diagnostic error messages
- System error messages
- Recovering the operating system
- Real-Time Clock (RTC Reset)
- Flashing the BIOS
- Backup media and recovery options
- WiFi power cycle
- Flea power release
- Getting help and contacting Dell
Table 5. System setup options—Boot Configuration menu
Boot Configuration
Boot Sequence Displays the boot sequence.
Secure Digital (SD) Card Boot Enable or disable the SD card read-only boot.
By default, the Secure Digital (SD) Card Boot option is not enabled.
Secure Boot
Enable Secure Boot Enable or disable the secure boot feature.
By default, the option is disabled.
Secure Boot Mode Allows you to modify the secure boot mode options.
By default, the Deployed Mode is enabled.
By default, the Audit Mode is disabled.
Expert Key Management
Enable Custom Mode Enable or disable custom mode.
By default, the custom mode option is not enabled.
Custom Mode Key Management Allows you to select the custom values for expert key management.
Table 6. System setup options—Integrated Devices menu
Integrated Devices
Date/Time Displays the current date in MM/DD/YYYY format and current time in
HH:MM:SS AM/PM format.
Camera Enables or disable the camera.
By default, the Enable Camera option is selected
Audio
Enable Audio Enable or disable the integrated audio controller.
By default, the Enable Audio option is enabled.
By default, the Enable Microphone option is enabled.
By default, the Enable Internal Speaker option is enabled.
USB Configuration
● Enable or disable booting from USB mass storage devices that are
connected to external USB ports.
By default, the Enable External USB Ports option is enabled.
● Enable or disable booting from USB mass storage devices such as external
hard drive, optical drive, and USB drive.
By default, the Enable USB Boot Support option is enabled.
Disable USB4 PCIE Tunneling (For
systems with discrete video card only)
Disable the USB4 PCIE Tunneling option. By default, this option is disabled.
Video/Power only on Type-C Ports
(For systems with discrete video card
only)
Enable or disable the Type-C port functionality to video or only power. By
default, the Video/Power only on Type-C Ports option is disabled.
Table 7. System setup options—Storage menu
Storage
SATA/NVMe Operation
SATA/NVMe Operation Set the operating mode of the integrated storage device controller.
By default, the RAID On option is enabled.
System setup 99